Bottom portion of a golf club head for a putter



FIG. 1 is a perspective view of a bottom portion of a golf club head for a putter showing our new design;

FIG. 2 is a plan view thereof

FIG. 3 is a heel side view thereof, the toe side view thereof being a substantial mirror image with respect to the claimed region; and,

FIG. 4 is a rear view thereof.

The broken line showing immediately adjacent the shaded portion forms an unclaimed boundary of the design. The broken line showing of the remainder of the golf club head for a putter and the unshown top and front of the putter form no part of the claimed design. 

The ornamental design for a bottom portion of a golf club head for a putter, as shown and described. 